In the corpus-based text to speech system,the choices of unit selection impact directly on the quality of synthesized speech.By analyzing the features of Tibetan language,this paper proposes not only a hybrid strategy which mixed components,characters,words and sentences,but also a corpus-based unit selection algorism for Ti-betan Speech Synthesis.Subjective assessment results and objective evaluation results indicate that the algorithms are effective,the coverage and synthesized speech of units are satisfactory reached expected target.%在基于语料库的语音合成方法中,语音合成单元选择的优劣直接影响合成语音的自然度和流畅性.该文针对藏语言文字的特点,提出以基本构件、组合构件、字、词及句单元相融合的混合单元语音合成策略,并提出了藏语语音合成混合单元选择算法.主观评价与客观评测数据表明该策略与算法有效和合理,各类合成单元在开放语料上的覆盖率与语音合成效果均达到预期的目标.
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